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Database homework help. Designs that hold up.

ER modeling, normalization, SQL and transactions for database systems courses. Designs that make sense and queries that return the right rows.

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What we cover

Every part of database your course covers.

Modeling

ER and EER diagrams
Relational mapping
Normalization (1NF–BCNF)
Functional dependencies

Querying

SQL joins and aggregates
Relational algebra
Views and subqueries
Query optimization

Internals

B+ trees and indexing
Transactions and ACID
Concurrency control
Recovery and logging

NoSQL

MongoDB documents
Redis
NoSQL schema design
When to choose NoSQL

Example order

One database order, start to finish.

What the student uploaded, what came back, and how the price was set.

01The brief

Intro to Database SystemsUndergradDue in 5 days

Normalize an enrollment schema to BCNF

Given one wide Enrollment table, find the functional dependencies, decompose to BCNF, show the decomposition is lossless and write the DDL with keys and constraints.

Requirements

List all functional dependencies
Step-by-step BCNF decomposition
Lossless-join argument
PostgreSQL DDL with keys

02The solution

schema.sql18 lines

1-- BCNF decomposition of Enrollment(sid, sname, cid, title, dept, grade)

2CREATE TABLE student (

3 sid INT PRIMARY KEY,

4 sname TEXT NOT NULL

5);

7CREATE TABLE course (

8 cid TEXT PRIMARY KEY,

9 title TEXT NOT NULL,

10 dept TEXT NOT NULL

11);

13CREATE TABLE enrollment (

14 sid INT REFERENCES student(sid),

15 cid TEXT REFERENCES course(cid),

16 grade CHAR(2) CHECK (grade IN ('A','B','C','D','F','W')),

17 PRIMARY KEY (sid, cid)

18);

DDL runs on PostgreSQL 15 · 0 errors

03The explanation doc

explanation.pdf

The dependencies

sid → sname, cid → title, dept and (sid, cid) → grade. The key is {sid, cid}.

BCNF violations

sid → sname and cid → title, dept have left sides that aren’t superkeys, so each is split out.

Lossless join

Each split shares a key with the remaining table, so joining them back loses nothing.

04The price

AI predicted budget

$60–$120

Level · UndergradIncluded

Deadline · 5 daysStandard

Shown before any contact details were shared.

Final price from our team

$85

Delivered 6h early

How it works

From upload to predicted budget in under a minute.

The AI does one job: it predicts your price. A senior engineer reviews your files and sets the final number.

01
Step 1 of 4
Upload your files
Prompt, rubric, starter code, or a screenshot of the task. PDF, DOCX, ZIP, code or images, in any mix.
02
Step 2 of 4
The AI asks what’s missing
It confirms your due date, then asks up to 3 questions your files don’t answer. Each one has an “I don’t know” option.
03
Step 3 of 4
See your predicted budget
A price range appears right away. No email, no sign-up.
04
Step 4 of 4
A senior engineer confirms your price
Leave your email. Within 5 minutes you get one fixed price. It never goes above the top of your range.

No payment to get a price. You pay only after you accept the fixed price. If the AI can’t price your files, an engineer emails you a price instead.

Typical orders

Common database assignments and typical budgets.

ER diagram and relational mapping

$60–$140

Usually 2–3 days

typical range

Normalization problem set

$50–$120

Usually 1–2 days

typical range

Transactions and concurrency

$60–$140

Usually 2–3 days

typical range

Full database application

$200–$450

Usually 5–8 days

typical range

Your budget depends on your files, deadline and level. Upload them for your own prediction.

Guarantees

Every order is covered. In writing.

Full refund, in three cases

We miss your deadline. Your code still doesn’t meet your original brief after revisions. Or you cancel before an engineer starts.

Partial refunds, worked out in the open

Cancel after work starts, or keep part of the work: we refund the rest and show you how we worked it out first.

Refunds that move fast

We reply within 24 hours. Approved refunds go back to your card through Stripe within 2 business days.

Unlimited revisions for 14 days

We revise until it matches your original instructions. No fees.

Your price is capped

Your fixed price never goes above the top of your range.

How the cap works

NDA and privacy

Your name, school and files are never shared, sold or reused. Engineers never see your name or email.

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Read the full refund policyFree. No email needed.

FAQ

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team@domyprogramminghomework.io

Do you handle relational algebra?

Yes, with proper notation (σ, π, ⋈) and step-by-step derivations.

Can you include an ER diagram?

Yes, in your course’s notation, as a PNG plus the editable source.

Do you cover internals?

Yes: B+ trees, hashing, concurrency and recovery problems.

Is the predicted budget the final price?

Not exactly, but it’s capped. Our team reviews your files and sends one fixed price before you pay anything, and it never goes above the top of your range.

What if you miss my deadline?

You get a full refund, back to your card through Stripe. It’s in our refund policy, in writing.

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